[issue29279] --with-pydebug optimizes too much

[Raymond Hettinger]

Raymond Hettinger added the comment:

> You can override CFLAGS when default option is not fit for you.

I concur with INADA and agree that the existing defaults should be left alone 
because they've worked well for many years and they provide all tolerably fast 
result for running the entire test suite (which is important for many 
developers).

--
nosy: +rhettinger
resolution:  -> rejected
status: open -> closed

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[issue29279] --with-pydebug optimizes too much

[INADA Naoki]

INADA Naoki added the comment:

I feel this is a problem of balance between speed and debugger usability.
I prefer default to -Og because:

* It's recommended by gcc for this purpose.
* --pydebug option is not only for gdb.  I use debug build to run various 
programs with many assertion.

You can override CFLAGS when default option is not fit for you.

--
nosy: +inada.naoki

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[issue29279] --with-pydebug optimizes too much

[Arcadiy Ivanov]

Arcadiy Ivanov added the comment:

gcc (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1)
Fedora 25

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[issue29279] --with-pydebug optimizes too much

[Arcadiy Ivanov]

New submission from Arcadiy Ivanov:

Around line 1480 of configure.ac:
if test "$Py_DEBUG" = 'true' ; then
# Optimization messes up debuggers, so turn it off for
# debug builds.
if "$CC" -v --help 2>/dev/null |grep -- -Og > /dev/null; then
OPT="-g -Og -Wall $STRICT_PROTO"
else
OPT="-g -O0 -Wall $STRICT_PROTO"
fi
else
OPT="-g $WRAP -O3 -Wall $STRICT_PROTO"
fi

The "-Og", unfortunately, optimizes too much resulting in local variables and 
arguments being optimized out:

(gdb) info locals
kwlist = {0x702c3318 "database", 0x702c3321 "timeout", 0x702c3329 
"detect_types", 0x702c3336 "isolation_level", 0x702c3346 
"check_same_thread", 0x702c3392 "factory", 0x702c3358 
"cached_statements", 
  0x702c336a "uri", 0x0}
database = 0x704f7da0 ":memory:"
detect_types = 0
isolation_level = 0x1
factory = 0x704c7dc0 
check_same_thread = 1
cached_statements = 4888694
uri = 0
timeout = 5
(gdb) info args
self = 
args = 0x7fffeff6be28
kwargs = 0x0

When "self" is optimized out it's too much optimization for debug mode.

--
components: Build
messages: 285505
nosy: arcivanov
priority: normal
severity: normal
status: open
title: --with-pydebug optimizes too much
versions: Python 3.6

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